Event Driven Simulation and Test-benches Event Driven Simulation - PowerPoint PPT Presentation

Event Driven Simulation and Test-benches

Event Driven Simulation • Continuous time and value simulation used for analog circuits • Differential equations should be solved • Very slow, too much accuracy for digital circuits

Event Driven Simulation • Discrete values used for digital circuits • ‘1’,’0’,’Z’ and ‘X’ used in verilog • This reduces the complexity of simulation • In digital circuits event driven approach is used instead of continuous time simulation • This also reduces complexity of simulation

Event Driven Simulation

Example • Zero-delay

Example • Effect of delay

The idea of Inertial Delay • To model time required for charge transitions • Close to what happens in RC circuits

Inertial Delay • Verilog simulators work based on inertial delay model, event De-scheduling is required

Test-Benches Example •